[Shader JIT] Start migrating to new, better ABI

include/PICA/dynapica/shader_rec_emitter_x64.hpp

@@ -42,9 +42,6 @@ class ShaderEmitter : public Xbyak::CodeGenerator {
 	// Compile instruction "instr"
 	void compileInstruction(const PICAShader& shaderUnit);
 
-	// Get the offset to be added to the rsp register to get the current return address
-	size_t getStackOffsetOfReturnPC();
-
 	bool isCall(u32 instruction) {
 		const u32 opcode = instruction >> 26;
 		return (opcode == ShaderOpcodes::CALL) || (opcode == ShaderOpcodes::CALLC) || (opcode == ShaderOpcodes::CALLU);
@@ -68,6 +65,9 @@ class ShaderEmitter : public Xbyak::CodeGenerator {
 	// Result is returned in the zero flag. If the comparison is true then zero == 0, else zero == 1 (Opposite of checkCmpRegister)
 	void checkBoolUniform(const PICAShader& shader, u32 instruction);
 
+	// Emit a call to a C++ function
+	void callCppFunc(void* function) { Helpers::panic("[ShaderJIT] Unimplemented: Add support for calling C++ functions in JITted code"); }
+
 	// Instruction recompilation functions
 	void recADD(const PICAShader& shader, u32 instruction);
 	void recCALL(const PICAShader& shader, u32 instruction);

include/PICA/dynapica/x64_regs.hpp

@@ -6,6 +6,7 @@ using namespace Xbyak;
 using namespace Xbyak::util;
 
 #if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
+#define PANDA3DS_MS_ABI
 constexpr Reg32 arg1 = ecx;  // register where first arg is stored
 constexpr Reg32 arg2 = edx;  // register where second arg is stored
 constexpr Reg32 arg3 = r8d;  // register where third arg is stored
@@ -20,6 +21,7 @@ constexpr Xmm arg4f = xmm3;
 constexpr bool isWindows() { return true; }
 
 #else  // System V calling convention
+#define PANDA3DS_SYSV_ABI
 constexpr Reg32 arg1 = edi;
 constexpr Reg32 arg2 = esi;
 constexpr Reg32 arg3 = edx;